Serrated Brushes : Silver or Copper

[R3VoLuTiOn]

I was just wondering which one would be better got my 9*2 for onroad. i want for the highest rpm

[TOMC2002]

Silver

[R3VoLuTiOn]

then why is it cheaper

[Grizzbob]

Actually, it's not that simple. The brush material does make a difference on how much power a motor can produce, but shouldn't otherwise have a major effect on its top end numbers. And there's also a trade-off, if you use brushes with much silver in them(especially in a low turn motor like yours), you will get plenty of power, but they'll eat the commutator up VERY fast(silver is quite hard on the comm surface), you'd need to be ready to retrue the comm before nearly EVERY run(I'd never run one more than 4 times max. between comm cuttings). Now, while more copper may not produce quite as much power, they are easier on the comm, so you could get more runs between rebuilds(especially a good copper/graphite brush compound). If you're just bashing, I'd STRONGLY recommend you not mess with silver-content brushes, thouse are really meant for hardcore racing(where we expect to rebuild frequently anyway)....:cool:

[R3VoLuTiOn]

lol u know wut. my region is filled with boaters and airplanes... not one single comm lathe in a 10 km radius of me.

[highroller]

Grizzbob is right unless you have access to a comm lathe you are looking for trouble. Another thing to be aware of using the proper spring tension. With that motor I'd start with a purple (bent with 5 degrees more tension) on the positive and red on negative. What brand motor is it? For non racing use standard type use Reedy 729 or a stock Japan brush from Kyosho or Trinity.
For a race setup and access to a lathe the Trinity 4383 makes the best power and alot more comm wear, some will use a Trinity 4383 on Positive and Reedy 729 or 732 on negative side. For laydown brushes Trinity 4490 or Reedy 760 (low wear, good power & comm wear) for all out competition Trinity 4500 med, 4499 (high power more wear) or Reedy 766 med, 767, 769 hollow more wear, best power producing.

[R3VoLuTiOn]

sgp 9*2, im lookin at the p-94 brushes cause im pretty sure thats all that would fit :confused:

[bAsEmEnTLOSI]

How much do comm lathes cost? Are they AC? Could you name a few for me, please. I might as well get one, because I would rather do stuff myself then pay for it to be done :D

[PatrickJ]

Are you racing in a professional event or you are just bashing?

[bAsEmEnTLOSI]

I am looking for a good comm lathe to use, since I race.

[Grizzbob]

Well, lathes can vary in price(& some of the difference is in how much stuff comes with it), but you can find some for around $100, & some can go as high as $350 or so. Personally, I've had a Cobra Pro Comm for several years(was about $120 then, now can be found for about $150 with a diamond bit, which I had to buy seperately) & I'm very happy with it. It still cuts like new(& a good diamond bit can last YEARS when taken care of), & all I needed to power it was an old mod motor can(which I put a used stock arm in & run with some gentle copper/graphite brushes & at 0 degrees timing) & a 4 cell battery(though I've since switched to using an old AT-style computer power supply to put 5 volts through it).....:cool:

[bAsEmEnTLOSI]

That's sounds expensive, but again, I'd rather to **** myself yo. I've heard some can run off chargers, like the LRP Pulsar Pro. I was also looking at chargers, to buy one sooner or later. I liked the Reedy Quasar Pro, or the LRP Pulsar Pro. Can't decide.

[highroller]

For the P94 size brushes look for the E after the brush number, 4383 is the standard with NT for no terminal or eyelet and E is for the Extra wide.

Of the lathes on the market I'd say Cobra for the price is best. I own the Stock 2000K and Modified 2000 lathe since they were available and rules allowed you to cut stock armatures. Others like Hudy and Fantom as high as 379, are nice to point but expense and features still don't make a big difference in the end result - comm still comes out true and smooth. With the Cobra lathes you have about 3-5 models to choose from, one that comes with the power base, diamond bit etc.